forked from OSchip/llvm-project
CodeGen: __uuidof should work even with an incomplete _GUID type
Summary: We would crash in CodeGen::CodeGenModule::EmitUuidofInitializer because our attempt to enter CodeGen::CodeGenModule::EmitConstantValue will be foiled: the type of the constant value is incomplete. Instead, create an unnamed type with the proper layout on all platforms. Punt the problem of wrongly defined struct _GUID types to the user. (It's impossible because the TU may never get to see the type and thus we can't verify that it is suitable.) This fixes PR16856. Reviewers: rsmith, rnk, thakis Reviewed By: rnk CC: cfe-commits Differential Revision: http://llvm-reviews.chandlerc.com/D1375 llvm-svn: 188481
This commit is contained in:
David Majnemer
parent
313ae7009e
commit
bbecd09658
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@ -2995,7 +2995,8 @@ CodeGenFunction::EmitCXXTypeidLValue(const CXXTypeidExpr *E) {
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}
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llvm::Value *CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
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return CGM.GetAddrOfUuidDescriptor(E);
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return Builder.CreateBitCast(CGM.GetAddrOfUuidDescriptor(E),
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ConvertType(E->getType())->getPointerTo());
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}
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LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
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@ -1057,22 +1057,9 @@ llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
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llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
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assert(Init && "failed to initialize as constant");
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// GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
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// first field is declared as "long", which for many targets is 8 bytes.
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// Those architectures are not supported. (With the MS abi, long is always 4
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// bytes.)
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llvm::Type *GuidType = getTypes().ConvertType(E->getType());
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if (Init->getType() != GuidType) {
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DiagnosticsEngine &Diags = getDiags();
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unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
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"__uuidof codegen is not supported on this architecture");
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Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
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Init = llvm::UndefValue::get(GuidType);
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}
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llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
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llvm::GlobalVariable *GV = new llvm::GlobalVariable(
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getModule(), Init->getType(),
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/*isConstant=*/true, llvm::GlobalValue::ExternalLinkage, Init, Name);
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GV->setUnnamedAddr(true);
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return GV;
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}
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@ -3077,26 +3064,24 @@ llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
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// Sema has checked that all uuid strings are of the form
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// "12345678-1234-1234-1234-1234567890ab".
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assert(Uuid.size() == 36);
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const char *Uuidstr = Uuid.data();
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for (int i = 0; i < 36; ++i) {
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if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
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else assert(isHexDigit(Uuidstr[i]));
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for (unsigned i = 0; i < 36; ++i) {
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if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuid[i] == '-');
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else assert(isHexDigit(Uuid[i]));
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}
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llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
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llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
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llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
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static const int Field3ValueOffsets[] = { 19, 21, 24, 26, 28, 30, 32, 34 };
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const unsigned Field3ValueOffsets[8] = { 19, 21, 24, 26, 28, 30, 32, 34 };
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APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
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InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
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InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
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InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
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APValue& Arr = InitStruct.getStructField(3);
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Arr = APValue(APValue::UninitArray(), 8, 8);
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for (int t = 0; t < 8; ++t)
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Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(
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llvm::APInt(8, StringRef(Uuidstr + Field3ValueOffsets[t], 2), 16)));
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llvm::Constant *Field3[8];
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for (unsigned Idx = 0; Idx < 8; ++Idx)
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Field3[Idx] = llvm::ConstantInt::get(
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Int8Ty, Uuid.substr(Field3ValueOffsets[Idx], 2), 16);
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return EmitConstantValue(InitStruct, GuidType);
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llvm::Constant *Fields[4] = {
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llvm::ConstantInt::get(Int32Ty, Uuid.substr(0, 8), 16),
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llvm::ConstantInt::get(Int16Ty, Uuid.substr(9, 4), 16),
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llvm::ConstantInt::get(Int16Ty, Uuid.substr(14, 4), 16),
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llvm::ConstantArray::get(llvm::ArrayType::get(Int8Ty, 8), Field3)
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};
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return llvm::ConstantStruct::getAnon(Fields);
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}
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@ -1,13 +0,0 @@
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// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-apple-macosx10.8.0 -fms-extensions -verify
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typedef struct _GUID
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{
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unsigned long Data1;
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unsigned short Data2;
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unsigned short Data3;
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unsigned char Data4[8];
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} GUID;
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struct __declspec(uuid("87654321-4321-4321-4321-ba0987654321")) S { };
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GUID g = __uuidof(S); // expected-error {{__uuidof codegen is not supported on this architecture}}
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@ -1,80 +1,112 @@
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// RUN: %clang_cc1 -emit-llvm %s -o - -DDEFINE_GUID -triple=i386-pc-win32 -fms-extensions | FileCheck %s --check-prefix=CHECK-DEFINE-GUID
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// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 -fms-extensions | FileCheck %s
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// RUN: %clang_cc1 -emit-llvm %s -o - -DDEFINE_GUID -DWRONG_GUID -triple=i386-pc-win32 -fms-extensions | FileCheck %s --check-prefix=CHECK-DEFINE-WRONG-GUID
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typedef struct _GUID
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{
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#ifdef DEFINE_GUID
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struct _GUID {
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#ifdef WRONG_GUID
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unsigned int SomethingWentWrong;
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#else
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unsigned long Data1;
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unsigned short Data2;
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unsigned short Data3;
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unsigned char Data4[8];
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} GUID;
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#endif
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};
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#endif
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typedef struct _GUID GUID;
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struct __declspec(uuid("12345678-1234-1234-1234-1234567890aB")) S1 { } s1;
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struct __declspec(uuid("87654321-4321-4321-4321-ba0987654321")) S2 { };
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struct __declspec(uuid("{12345678-1234-1234-1234-1234567890ac}")) Curly;
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#ifdef DEFINE_GUID
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// Make sure we can properly generate code when the UUID has curly braces on it.
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GUID thing = __uuidof(Curly);
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// CHECK: @thing = global %struct._GUID zeroinitializer, align 4
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// CHECK-DEFINE-GUID: @thing = global %struct._GUID zeroinitializer, align 4
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// CHECK-DEFINE-WRONG-GUID: @thing = global %struct._GUID zeroinitializer, align 4
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// This gets initialized in a static initializer.
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// CHECK: @g = global %struct._GUID zeroinitializer, align 4
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// CHECK-DEFINE-GUID: @g = global %struct._GUID zeroinitializer, align 4
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// CHECK-DEFINE-WRONG-GUID: @g = global %struct._GUID zeroinitializer, align 4
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GUID g = __uuidof(S1);
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#endif
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// First global use of __uuidof(S1) forces the creation of the global.
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// CHECK: @_GUID_12345678_1234_1234_1234_1234567890ab = unnamed_addr constant %struct._GUID { i32 305419896, i16 4660, i16 4660, [8 x i8] c"\124\124Vx\90\AB" }
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// CHECK: @gr = constant %struct._GUID* @_GUID_12345678_1234_1234_1234_1234567890ab, align 4
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// CHECK: @_GUID_12345678_1234_1234_1234_1234567890ab = constant { i32, i16, i16, [8 x i8] } { i32 305419896, i16 4660, i16 4660, [8 x i8] c"\124\124Vx\90\AB" }
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// CHECK: @gr = constant %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to %struct._GUID*), align 4
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const GUID& gr = __uuidof(S1);
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// CHECK: @gp = global %struct._GUID* @_GUID_12345678_1234_1234_1234_1234567890ab, align 4
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// CHECK: @gp = global %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to %struct._GUID*), align 4
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const GUID* gp = &__uuidof(S1);
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// CHECK: @cp = global %struct._GUID* @_GUID_12345678_1234_1234_1234_1234567890ac, align 4
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// CHECK: @cp = global %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ac to %struct._GUID*), align 4
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const GUID* cp = &__uuidof(Curly);
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// Special case: _uuidof(0)
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// CHECK: @zeroiid = constant %struct._GUID* @_GUID_00000000_0000_0000_0000_000000000000, align 4
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// CHECK: @zeroiid = constant %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_00000000_0000_0000_0000_000000000000 to %struct._GUID*), align 4
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const GUID& zeroiid = __uuidof(0);
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// __uuidof(S2) hasn't been used globally yet, so it's emitted when it's used
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// in a function and is emitted at the end of the globals section.
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// CHECK: @_GUID_87654321_4321_4321_4321_ba0987654321 = unnamed_addr constant %struct._GUID { i32 -2023406815, i16 17185, i16 17185, [8 x i8] c"C!\BA\09\87eC!" }
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// CHECK: @_GUID_87654321_4321_4321_4321_ba0987654321 = constant { i32, i16, i16, [8 x i8] } { i32 -2023406815, i16 17185, i16 17185, [8 x i8] c"C!\BA\09\87eC!" }
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// The static initializer for thing.
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// CHECK-DEFINE-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @thing to i8*), i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ac to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-WRONG-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @thing to i8*), i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ac to i8*), i32 4, i32 4, i1 false)
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// The static initializer for g.
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// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @g to i8*), i8* bitcast (%struct._GUID* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @g to i8*), i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-WRONG-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @g to i8*), i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 4, i32 4, i1 false)
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#ifdef DEFINE_GUID
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void fun() {
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// CHECK: %s1_1 = alloca %struct._GUID, align 4
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// CHECK: %s1_2 = alloca %struct._GUID, align 4
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// CHECK: %s1_3 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-GUID: %s1_1 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-WRONG-GUID: %s1_1 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-GUID: %s1_2 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-WRONG-GUID: %s1_2 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-GUID: %s1_3 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-WRONG-GUID: %s1_3 = alloca %struct._GUID, align 4
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// CHECK: [[U1:%.+]] = bitcast %struct._GUID* %s1_1 to i8*
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// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U1]], i8* bitcast (%struct._GUID* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-GUID: [[U1:%.+]] = bitcast %struct._GUID* %s1_1 to i8*
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// CHECK-DEFINE-WRONG-GUID: [[U1:%.+]] = bitcast %struct._GUID* %s1_1 to i8*
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// CHECK-DEFINE-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U1]], i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-WRONG-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U1]], i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 4, i32 4, i1 false)
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GUID s1_1 = __uuidof(S1);
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// CHECK: [[U2:%.+]] = bitcast %struct._GUID* %s1_2 to i8*
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// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U2]], i8* bitcast (%struct._GUID* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-GUID: [[U2:%.+]] = bitcast %struct._GUID* %s1_2 to i8*
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// CHECK-DEFINE-WRONG-GUID: [[U2:%.+]] = bitcast %struct._GUID* %s1_2 to i8*
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// CHECK-DEFINE-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U2]], i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-WRONG-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U2]], i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 4, i32 4, i1 false)
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GUID s1_2 = __uuidof(S1);
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// CHECK: [[U3:%.+]] = bitcast %struct._GUID* %s1_3 to i8*
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// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U3]], i8* bitcast (%struct._GUID* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-GUID: [[U3:%.+]] = bitcast %struct._GUID* %s1_3 to i8*
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// CHECK-DEFINE-WRONG-GUID: [[U3:%.+]] = bitcast %struct._GUID* %s1_3 to i8*
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// CHECK-DEFINE-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U3]], i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 16, i32 4, i1 false)
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// CHECK-DEFINE-WRONG-GUID: call void @llvm.memcpy.p0i8.p0i8.i32(i8* [[U3]], i8* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to i8*), i32 4, i32 4, i1 false)
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GUID s1_3 = __uuidof(s1);
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}
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#endif
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void gun() {
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// CHECK: %s2_1 = alloca %struct._GUID, align 4
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// CHECK: %s2_2 = alloca %struct._GUID, align 4
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#ifdef DEFINE_GUID
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// CHECK-DEFINE-GUID: %s2_1 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-WRONG-GUID: %s2_1 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-GUID: %s2_2 = alloca %struct._GUID, align 4
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// CHECK-DEFINE-WRONG-GUID: %s2_2 = alloca %struct._GUID, align 4
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GUID s2_1 = __uuidof(S2);
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GUID s2_2 = __uuidof(S2);
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#endif
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// CHECK: %r = alloca %struct._GUID*, align 4
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// CHECK: %p = alloca %struct._GUID*, align 4
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// CHECK: %zeroiid = alloca %struct._GUID*, align 4
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GUID s2_1 = __uuidof(S2);
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GUID s2_2 = __uuidof(S2);
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// CHECK: store %struct._GUID* @_GUID_87654321_4321_4321_4321_ba0987654321, %struct._GUID** %r, align 4
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// CHECK: store %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_87654321_4321_4321_4321_ba0987654321 to %struct._GUID*), %struct._GUID** %r, align 4
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const GUID& r = __uuidof(S2);
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// CHECK: store %struct._GUID* @_GUID_87654321_4321_4321_4321_ba0987654321, %struct._GUID** %p, align 4
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// CHECK: store %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_87654321_4321_4321_4321_ba0987654321 to %struct._GUID*), %struct._GUID** %p, align 4
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const GUID* p = &__uuidof(S2);
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// Special case _uuidof(0), local scope version.
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// CHECK: store %struct._GUID* @_GUID_00000000_0000_0000_0000_000000000000, %struct._GUID** %zeroiid, align 4
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// CHECK: store %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_00000000_0000_0000_0000_000000000000 to %struct._GUID*), %struct._GUID** %zeroiid, align 4
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const GUID& zeroiid = __uuidof(0);
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}
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